Is FormFlat free to use without a subscription?

Yes, FormFlat is 100% free with no accounts, no monthly paywalls, and no download watermarks.

Are my confidential files uploaded to any servers?

No. All PDF rendering, form filling, signature baking, and vector flattening happen strictly inside your browser using Web Workers and WebAssembly.

What is PDF flattening and why does it fix the Mobile Blank Bug?

Many mobile viewers (iOS Files, Android, Gmail previews) do not render interactive AcroForm fields properly. FormFlat bakes text and signatures directly into permanent vector content streams, ensuring universal rendering on every device.

Is the whiteout permanent after downloading?

Yes. When you click Flatten & Download, the whiteout rectangle is baked into the PostScript vector stream, permanently concealing the covered area.

Whiteout and Mask Text on PDF Documents Online for Free

Easily cover outdated text, erroneous numbers, or confidential data with clean vector whiteout rectangles, then type correct information directly over the top.

Step-by-Step Guide

STEP 1

1. Open Document

Load the PDF you need to redact or correct.

STEP 2

2. Draw Whiteout Box

Select Whiteout (W) from the toolbar and drag a rectangle over the target area.

STEP 3

3. Type New Text

Select the Text tool and type the corrected information over the whiteout block.

Frequently Asked Questions

Is the whiteout permanent after downloading?: Yes. When you click Flatten & Download, the whiteout rectangle is baked into the PostScript vector stream, permanently concealing the covered area.